import VoiceFocusTransformDevice from './VoiceFocusTransformDevice';
/**
 * A device observer that is notified of lifecycle events on an Amazon Voice Focus device.
 *
 * Use {@link VoiceFocusTransformDevice.addObserver|addObserver} to register an
 * observer with a device.
 */
export default interface VoiceFocusTransformDeviceObserver {
    /**
     * Called if application of Amazon Voice Focus to an inner device failed, and
     * the {@link VoiceFocusTransformDevice|VoiceFocusTransformDevice} fell
     * back to using the inner device directly.
     *
     * @param device The device signaling the event.
     * @param e The error that triggered the fallback.
     */
    voiceFocusFellBackToInnerStream?: (device: VoiceFocusTransformDevice, e: Error) => void;
    /**
     * Called if noise suppression is unable to keep up with the audio stream. This
     * can occur if:
     *
     * * You specified a model variant that is too complex for the compute environment.
     * * The user is performing other actions on the device that are taking significant
     *   CPU.
     * * You allowed estimation-based selection of model variant, and the environment
     *   at the time was less constrained than the normal runtime environment.
     *
     * This method will be called after approximately 15ms of audio has been
     * interrupted, and will be periodically called thereafter.
     *
     * This method indicates that the user will be experiencing audio glitching, and
     * your application should take action. This might include:
     *
     * * Disabling Amazon Voice Focus.
     * * Disabling other features, e.g., limiting the number of video tiles.
     * * Notifying the user.
     */
    voiceFocusInsufficientResources?: () => void;
}